I. Who Celebrates?

From The Catechism of the Catholic Church

1138
“Recapitulated in Christ,” these are the ones who take part in the
service of the praise of God and the fulfillment of his plan: the heavenly
powers, all creation (the four living beings), the servants of the Old and New
Covenants (the twenty-four elders), the new People of God (the one hundred and
forty-four thousand),⁴ especially the martyrs “slain for the word
of God,” and the all-holy Mother of God (the Woman), the Bride of the
Lamb,⁵ and finally “a great multitude which no one could number,
from every nation, from all tribes, and peoples and tongues.”⁶

PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

SECTION ONE THE SACRAMENTAL ECONOMY
- CHAPTER TWO THE SACRAMENTAL CELEBRATION OF THE PASCHAL MYSTERY
  - Article 1 CELEBRATING THE CHURCH’S LITURGY
    - I. Who Celebrates?

From The Catechism of the Catholic Church – rosary.team